<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    我是open打开的页面。
</body>

</html>
<script>
    document.onclick = function() {
        if (window.confirm('你确定要关闭吗?')) {
            window.close();
        }
    }
</script>